php合并两个二维数组，二维数组按键名排序，删除二维数组元素，二维数组按相同字段合并）

一、两个二维数组的合并

$a=Array(0 => Array("id" => 66,"class_name" => "www.iiwnet.com"),1 => Array("id" => 67,"class_name" => "linux" ));
$b=Array(0 => Array("class_count"=> 8),1 => Array("class_count" => 2));

方法一：

php提供了一个方便的函数：

array_merge_recursive($as_activity,$array['data']['as_activity']);//合并两个数组

方法二：

自己手动实现

$arr2 = array();

$n = 0;
foreach($a as $k => $v){
foreach($v as $k1 => $v1){
$arr2[$n][$k1] = $v1;
}
$n++;
}
foreach($b as $k => $v){
foreach($v as $k1 => $v1){
$arr2[$n][$k1] = $v1;
}
$n++;
}

输出：

array(4) { [0] => array(2) { ["id"] => int(66) ["class_name"] => string(14) "www.iiwnet.com" } [1] => array(2) { ["id"] => int(67) ["class_name"] => string(5) "linux" } [2] => array(1) { ["class_count"]
=> int(8) } [3] => array(1) { ["class_count"] => int(2) }}
2、php对二维数组按其中某个值，进行排序

$sort = array(
'direction' => 'SORT_DESC', //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
'field'     => 'publish_date',       //排序字段
);
$arrSort = array();
foreach($result AS $uniqid => $row){  		//$result
foreach($row AS $key=>$value){
$arrSort[$key][$uniqid] = $value;
}
}
if($sort['direction']){
array_multisort($arrSort[$sort['field']], constant($sort['direction']), $result);
}

3、其他

unset($as_activity[0]);//删除数组元素，删除后的数组，不是索引数组
$as_activity = array_values($as_activity);//重建索引数组
array_merge_recursive($as_activity,$array['data']['as_activity']);//合并两个数组

array_column($array,'key')//（二维数组，二维数组的key）得到二维数组中的某一列值

$res = array(); //想要的结果
foreach ($result as $k => $v) {
$res[$v['time']][] = $v;
}//二维数组按相同字段合并